Hi again,I have another problem about struct now,For example if I have a variable contains this : #S(ini__trs_0__call_0_0 :k 0 :b #(#(1 2 3) 3) :cs #S(ini___1 :a #(#(1 2 3) 3)) :st #<Function (internal step_0 0)> :fi #<Function (internal final 0)>) and I want to retrive each eelment of the struct, for example I want to get the value of the b which is #(#(1 2 3) 3) in this struct. Is there any way to do that ! I checked those links that was sent here but I didn't find anything related to what I need !